package com.iweb.xt.sso.handler;

import com.iweb.xt.common.login.UserThreadLocal;
import com.iweb.xt.common.model.BusinessCodeEnum;
import com.iweb.xt.common.model.CallResult;
import com.iweb.xt.sso.service.TokenService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

//登录拦截
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private TokenService tokenService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取cookie 从cookie中拿到token
        //解析token
        Cookie[] cookies = request.getCookies();
        if (cookies == null) {
            returnJson(response);
            return false;//拦截
        }
        String token = "";
        for (Cookie cookie : cookies) {
            if (cookie.getName().equals("t_token")) {
                token = cookie.getValue();
            }
        }
        //token可能存在 也可能不存在
        if (StringUtils.isBlank(token)) {
            returnJson(response);
            return false;
        }
        //到这里的时候 token存在
        CallResult callResult = tokenService.parseToken(token);
        Object result = callResult.getResult();
        Long userId = null;
        if (result == null) {
            //没有登录过
            returnJson(response);
            return false;
        } else {
            userId = (Long) result;
            UserThreadLocal.put(userId);
        }
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //在结束之后 一定要记得清空ThreadLocal 否则会发生内存泄露
        UserThreadLocal.remove();
    }

    private void returnJson(HttpServletResponse response) {
        PrintWriter writer = null;
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json;charset=utf-8");
        try {
            writer = response.getWriter();
            CallResult callResult = CallResult.fail(BusinessCodeEnum.NO_LOGIN.getCode(), "您的登录已失效");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
    }

}
